ZANONIA . 597 
gins of the body of the seed, but produced at either end into 
an expansion as long as the body of the seed itself. The 
seed otherwise has I think the ordinary characteristic struc- 
ture, except the commissure of the cotyledones is very indis- 
tinet, and only to be recognised in a very thin transverse sec- 
n. 
The dehiscence takes place along the 3 lines visible in the 
E flat summit: and the 3 valves so formed, which are internally 
thick and fleshy at first, and as it were continuous with the 
placenta, become by the drying of the tissues, inflexed. 
The remarkable points, and such as I would enter in the 
generic character, are the three large elongated triangular 
placentze, the 3-valvular dehiscence of the apex, the inflexion 
of the valves, binary and winged seeds. 
= According to Arnott's definition the wing of the seed is 
considered as of secondary importance, but to me it ap- 
pears remarkable, not only because 1 know of no tendency 
. to the formation of a wing in any plant of the order known 
. to me, but because in many, the margin in Zanonia so much 
developed, is channelled or grooved deeply, so that I would 
rather have expected two wings, one on either side of the 
actual margin, than such a one as exists in Z iionia. 
.. The seeds of cucurbitacea, so far as I know present either 
à blunt simple margiu, or a grooved one, the first may per- 
haps be taken as an argument against a tendency to be 
: Winged, the second would seem to indicate,the possibility of 
the occurrence of two wings, in either case Zanonia is re. 
markable, 
Capsula infra apicem annulata, imo apice trivalvis demum 
Valvis inflexis placentæ trigonæ maximæ. Semina two cuique 
Placentæ pendulæ, marginatæ alatæ. 
Fig. II. rm 
l. Very young flower bud. 
7. Shews the stigmata and placentz, the spaces between the 
